Uses discharge of a capacitor bank to inject from a few, up to hundreds of amps into a battery.

The two meters show cap bank volts and battery voltage. As the sulphate is dissolved back into the electrolyte, the internal resistance of the battery falls, and current tries to increase. This is limited by a resistor, so the bank voltage will drop and the batt voltage rise. This is an indicator the process is underway.

Last edited by Dr Chaotica on Sat Jan 26, 2013 12:45 am; edited 3 times in total

All parts are scrounged from old equipment, except the vero, which I had, and the 555s, which I bought.

18 Volt 3 amp transformer over-wound to 22 Volts, gives about 30 volts unloaded on the caps, which are only 35 volts working. Twin BUZ11 MOSFETs, control the charge time, which is currently a pulse width of 5 microseconds at 1.4 kHz. The blue and white twisted wire will connect to a front panel switch, and engage a second capacitor in parallel to the first on the board, thus lengthening the pulse period to 13 uS. Thus realizing a high/lo function.

This will form my background unit and a more powerful device is in construction, with greater options over the frequency and time period, as well as hopefully, a current regulated supply to replace the current limit resistor. I have a L296 board I can modify, and this will, if successful, allow fine control over a range of several amps input via a front panel pot.